Cutting mechanism.



No. 810,993. PATENTED JAN. 30, 1906.

F. E. STRASBURG. CUTTING MECHANISM.

APPLICATION FILED MAY 4. 1905.

3 SHEETSSHEET 1.

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PATENTED JAN. 30, 1906.

F. E. STRASBURG. CUTTING MECHANISM. APPLIUATION FILED MAY4.1905.

3 SHEETSSHBET 2.

PATENTED JAN. 80, 1906.

3 SHEETS-SHEET 3.

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APPLICATION FILED MAY4.1905,

Wm eases narn'r orrrh FREDERFUK E. STRASBURG, OF RUMFORD FALLS. MAINE, ASSTGNOR TO OONTlNENTAL PAPER BAG COMPANY, A UORPORATlON OF MAINE.

narrates inaonnnisin.

no. erases.

Specification of Letters Patent.

Fatented Jan. 30. 1906.

Application filed May 4, 1905. Serial No. 258,820.

. and State of Maine, have invented certain new and useful Improvements in Cutting Mechanism, of which the following is a specification.

This invention relates to cutting mechanism, particularly to that class of such mechanism as is employed for severing a continuous Web of aper inte blanks or sections of uniform and predetermined length. In the drawings accompanying this s ecification is illustrated a machine embo ying one form, and which may be the-preferred form, of my invention.-

ln-the drawings, Figure 1 is a plan view of said machine. Fig. 2 is a side elevation corresponding with Fig. 1, but with the driving pu ley removed. Fig. 3 is an enlarged plan view of details of the severing mechanism; and Fig. 4 is a sectional elevation corresponding to 3, the section being taken on line a a therein. Fig. 5 is a rear view of a portion of one of the serrated knives. Fig. 6 is a cross-section of float F on line b bof Fig. 4.

My invention is peculiarly applicable in connectionwithpapenbag machines inwhich it is desired to sever a continuous paper tube into lengths suitable for be -blanks. Such paper tube may be a simple at tube, or said tube may be provided with an inwardly-fo1ded tuck in each side thereof. My improved mechanism is also adapted for severing continuous webs, tubular or otherwise, having other forms of cross-section or for severing flat continuous single, double, or multiple Webs and all of the plies of which may ass above the float or part above and part be ow. It is particularly desirable in severing pa per tubing into bag-blank sections to provide at the forward end thereof a difference in length of the upper and lower plies, so that one ply may be gripped by the ba -bottomforming mechanism without invo ving the other ply. Preferably the upper ply of the tubular blank is the shorter, whereby the lower ly is allowed to project in front thereof. his provides at the other end of .the blank, and which other end is later the mouth of the finished bag, a rearwardly-extending lip on the upper ply, whereby the bag-mouth may be conveniently opened for use. My

improved machine provides for the formation in severing, on the ends of each section thereof, of projecting portions, as described.

In order to obtain good results in a rotary cutting mechanism for tubular paper webs, it is desirable, first, to have the cutting edge of the rotating serrated knife travel at a considerably greater linear speed than that of the web to be cut; second, to have the circledescribed by the cutting-knife of a relatively small diameter, so as to have the distance traveled by said knife in enga ement with the stationary float relatively short. The first feature is desirable so that the tubular, web may be severed with certainty and completeness and without connecting filaments remaining between the web and the severed section. The second feature is desirable so that the rotating cutter may upset as little as pos said cutter swings out of engagement with the flo at.

.sible the rear end of the severed blank as Heretofore in rotary cutting devices the paths of the rotating knives have each had a circumference e ual to or nearly equal to the length of the bankthat it was desired to sever, and when a different len th of blank was desired it was necessary to c ange the diameter of the paths of the rotating knives to correspond. In my improvement such change in diameters is unnecessary, as a simple change in gearing is all that is necessary.

The machine illustrated in the drawings comprises side frames 2 3, in whlch may be supported the various parts of the mechanism. These side frames may be secured in suitable relation to each other by tie-frames 4 5, extending therebetween and fastened at their ends, respectively, to said side frames by bolts, as 6.

At F in the right-hand or entering end of the machine is shown the delivery end of some suitable tube-forming mechanism. Tlns member F is in the nature of a float and is of suitable width to pass through an opening be.- tween feed-rolls 7 8. This opening is formed by op ositely-disposed reduced port1ons,as9, in said rolls. Float F lies within and is surrounded by the paper tube which it is desired to sever. If said tube is provided with mwardl -folded tucks, said tucks are preferably isposed below the float. My improved machine is provided with two pairs of feedrolls 7 8 and 11 12, respectively, and which two pairs of rolls are driven at the same surface speed from pulley by means of suitable gearing. This gearing is as follows:'

qTurning freelyupon stud 13 ,which stud projects outwardly from frame 2, is driving-gear 14. Pulley 10 is fast to hub 15 of gear 14, and through said pulley said gear may be driven. Rolls 7 8 are fastto and supported for revolution upon shafts 17 18, respectively, and

,. are fast to and supported for revolution upon shafts 23 24, res ectivel and which shafts are provided wit suitab e bearings in brackets 26 27, upstanding from frames 2 3, respectively. Shafts 23 24 are provided with intermeshing gears 25, respectively, and lower gear 25 is engaged by drivingear14. On ad'ustable stud 28 is gear 29, an on adjustable stud 30 is gear 31. Gear 29 meshes with driving-gear 14, and fast on shaft 32, mounted for rotation in frame 2, isgea'r 33. Said gear 33 meshes on the one side with gear 29 and on the other side with gear 31. On stud 34, projecting outwardly from frame 2, is rotatably mounted gear 35. Said gear 35 meshes on the one side with gear 31 and on the other with gear 22 of feed-roll 8. By the gearing just described the two sets of feedrolls 7 8 and 11 12, respectively, may be driven to feed the web of paper in the direction of arrow A.

In bracket 36, secured tobrackets 16 19 by suitable bolts, as 37, are mounted cuttershafts 38 39. These shafts are geared together by equal gears 40 41, respectively, and" thereon only throughout, a portion of its periphery and whereby gear 43 is intermittently driven. Also ear 43 has a stop-face 44 for engagement wit that portion 45 of the periphery of gear 42 which is unprovided with teeth for holding gear 44 against rotation when so engaged. By the means just described shafts 38 39 may be revolved one revolution each during 'a portion of the revolution of gear'42j and then held at rest during the remainder of the revolution of that gear.

After passing between rolls ,7 8. float F is widened out to occupy substantially the whole width of the inside of the tubular web. In the upper face of said floatinaline directly below and parallel with shaft 38 is provided a series of contiguous grooves 46 thereacross. These grooves are preferably V -shaped in cross-section and may be formed by milling with v a cutter of somewhat larger diameter than that of the circle described by the rotation of the cutting edge of serrated knife 50,

' preferabl or said grooves may be formed by other means and have other longitudinal profiles, respectivel ,than that of a circle. Shaft 39 is ocated a short distance in the direction 0 travel of the web to be out beyond shaft 38, and in the bottom face of float F, di: rec-tly above and parallel with shaft 39, is a series of'contiguous grooves 56 thereacross, similar in every way to grooves 46 in the upper face of said float. Grooves 56 are offset laterally from grooves 46 a distance equal to one half their pitch or distance from one another,

so that the upper and lower grooves will not I cut into one another, and thereby unduly weaken the float. (See Fig.6.) Shafts-38 39 are of such size and so located with reference to each other that float F has sufficient space to pass therebetween but said float referably stands free of said shafts, so as to a ow unobstructed travel of the paper web as it moves forwardly about the float.

' Shaft 38 is cut away lengthwise thereof on one side at 47 for the reception of serrated knife 50. In the resent instance face 47 is shown as curved engthwise; but any other desired profile may be used. Said knife 50 conforms to the profile of face 47 and may besecured to shaft 38 by any convenient means, such as screws 48, engaging with slots, such as 49, in the knife and threaded into said shaft. The cutting edge of said knife conforms to the eriphery of a cylinder having a diameter sliglitly in excess of that of shaft 38. Thus the points 51. of the edge of said knife are enabled to engage slots 46 in the upper face of float F. On knife 50 there is a cutobvious that other profiles of face 490 and edge 61 could be substituted for the straight line illustrated. Knife 60 is secured to shaft 39 by screws 52, and the path of its cutting edge conforms to the periphery of a cylinder havin a diameter slightly in excess of that -ef shaft 39 whereby points 61 are enabled to engage slots 56 in the under face of float F. Said points 61 and slots 56 are equal in num ber and equally spaced, whereby a continuous cutting-line is maintained entirely across the under face of the float. Shafts 38 39 are so timed in relation to each other that the ends of the cutting edge 61 of cutter 60 rotate directly inadvance and closely contiguous to the, ends, respectivel of curved cutting edge 51 of knife 50. y this arrangement the tubular web may be severed with certainty and precision at its edges. Knives 50 60.normally stand with their cutting edges pointed upwardly and downwardly, respectively, as shown in Fig. 2. j

' As illustrated, the relative sizes of gears 42 43 are such that gear 43 revolves once during about one-quarter of each revolution of gear 42 and remains at rest during about threeuarters of each revolution thereof. Also t e relative speeds of gear 43 and rolls 7 8 and 11 12 are such that knives 50 60 while run ning travel at alinear s eed about fifty per cent. greater than that o the paper web to be severed. By increasing the diameter of gear 33 the paper web will be fed faster relative to the operation of the cutting mechanism, and

' date changes in the diameter of said gear 33.

In studs 53 54, projecting from brackets 26 27, respectively, is supported shaft 55. On said shaft is fixed table 62,,which assists the paper web into engagement with rolls 11 12 and thence out of the machine. Said table is cut away at 560 to allow high portions "57 of roll 11 to engage correspondin high portions of roll 12 for the feeding of t e paper web.

' .The operation of my improved machine is as follows: Suitable paper tubing, either with or without inwardly-folded tucks, being delivered around float F, is led forward between rolls 7 8 and thence between shafts 38 39 and beyond the end F of float F onto table 62 and into the grip of rolls 11 12. If tubing having an inwardly-folded tuck in each side thereof is used, said tubing may be fed into the machine with the tucks either above or below the float; but when my improved machine is used in connection with paper-bag machinery it is customary and desirable to dispose the tucks under the float. The machine is then started in the'direction indicated by the arrow on pulley 10. The paper web is fed forward until the leading tooth 420 of gear 42 engages stop 430 of gear 43., whereby said gear 43 is started rotating, and knives 6O throughout the entire wi th thereo "mencing first at its outside edges, and thence are thereby revolved to engagement with grooves 46 56, respectively, of float F. Knife 50 in swinging into grooves 46 presses the upper ply of the paper tube-down into said grooves 46, thereby successively puncturing and substantially severin said upper ply comtoward and at the middle thereof. Furthermore, by means of the excess speed of knife 50 over that of the paper that ortion of the pa er directly in advance 0ft 0 knife is pushe' forward, and anyremaining ortions thereof which may be stlll joined to t at por tion of the paper rearward of the knife are therefore broken therefrom and the severance completed. The relatively short radius of rotation of cutting edge 51 of knife 50 enables it to swing promptly out of enga ement with the paper, whereby upsetting of t e rear end of the severed section 1s prevented. Directly succeedin the commencement of the operation of kni e 50, just described, knife on shaft 39 rotates against the lower ply of the tubular web and passes into engagement with slots 56 in the under face of float F just in advance vertically of the ends of blade 50. The operation of said knife 60 is the same in all respects as that of knife 50, except as knife 60 has its cutting edge in a straight line all ofits teeth 61 will enter the paper simultaneously. Knife 60 thus penetrates and 'severs the lower pl of the tubular web, 1n-

cluding the inwar ly-folded tu'ckstherein, and by the combined action of knives 50 60 said tubular web is entirely severed. The operation is thus completed, and the severed section is conducted awayover table 62 by means of rolls 11 12. i

I claim- 1. The combination of a float havin a plurality of laterally contiguous grooves lengthwise in the face thereof, an intermittentlyrotatable knife contiguous to the float, said knife having a plurality of teeth for enga ement with the grooves respectively, in t e float, all combined and working together substantially as described.

2. The combination of a float havin a plurality of laterally-contiguous grooves engthwise in the face thereof, an intermittentlyrotatable knife contiguous to the float, said knife having a plurality of teeth for enga ement with the grooves respectively in t e float, means to feed a webbetween the float and knife, means to intermittently rotate the knife at a linear speed greater than the feed of the web all combined and operating together substantially as described.

3. The combination of afloat havin aplu- IIO rality of laterally-contiguous rooves engthwise in each side thereof, sai grooves being suflicient in number to extend substantially the width of each side of said float, a rotatable knife above the float, said knife having a plurality of teeth for engagement with each of the ooves respective y in the up er face of the cat, a rotatable knife below t e float, said knife having a plurality of teeth for engagementwith each of the tively in the under face of t e float, means to feed a web around the float and between the float and the knives and means to rotate the knives intermittently and at a linear speed gfeater than the feed of the web.

T e combination of a float havin a plurality of laterally-contiguous rooves engthwise in each face thereof, sai grooves being sufficient in number to extend substantially ooves respectogether substantially as described.

5. The combination of a float havin a plurality of ooves lengthwise in eac face thereof, said grooves in the upper face of the I float being longitudinally substantially opposite the grooves in the lower face of the float and spaced laterally intermediate thereof respectively; a rotatable knife above the float, said knife having a plurality of teeth for engagement with the grooves respectively in the up er face of the float, and a rotatable knife be 0w the float, said knife having a plurality of teeth for engagement with the grooves respectively in the lower face of the oat;'and means to intermittently rotate the knives, all combined and operating together substantially as described.

6. The combination of a float havin a plurality of laterally-contiguous grooves engthwise in the face thereof, a rotatable knife above the float, said knife having a plurality of teeth for engagement with the ooves respectively, in the float, means to eed a web over the float and under the rotatable knife,

7. The combination of a float havin a-plu I rality of laterally-contiguous grooves engthwise in the face thereof, a rotatable knife above the float, said knife having a plurality of teeth for engagement with the grooves respectively in the float, means to normally hold the knife out of engagement with the float and means to intermittently rotate the knife, all combined and operating together substantially as described.

8. The combination of a float having a plurality of oov'es lengthwise in each face thereof, said grooves in the upper face of the float being longitudinally substantially opposite the grooves in the lower face of the float and spaced laterally intermediate thereof respectively and none of said rooves perforating said float; a rotatable nife above the float and a rotatable knife below the float, each knife having teeth for enga ement with the grooves respectively in t e float, all combined and operating together, substantially as described.

Signed at Rumford Falls, Maine, this 1st day of May, 1905, in the presence of two subscribing witnesses.

FREDERICK E. STRASBURG.

Witnesses:

JOHN P. SHEPHERD, HAROLD SMrTHwIcK. 

